Let me tell you, those sleeves are just weird. The under-sleeve is very narrow but instead of curving with the wearer's arm, it fights that curve at the hem. This may be because of the very strange pitch of the inner seam of the front sleeve. This explains the odd grain angle at the lower end of the sleeve, visible on Vogue's website pictures of the jacket.
And as you can see in the dreadful photo at right, there is some unattractive excess fabric in the upper arm as well. I expected slender, elegant and anatomically correct. Instead ... well, an inmate has escaped wearing baggy prison clothing.
In other news, I am going to pinch out some fabric along the princess line above the bust, and I think the waist is too low on me. I'll take 1cm out above the waist. Otherwise, the bodice seems fine to me.
I am going to have to think about this.